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3.11. UART Interface
The module provides two UART interfaces: main UART interface and debug UART interface. The
following shows the different features.
Main UART interface supports 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600bps
baud rate, and the default is 115200bps. This interface can be used for data transmission and AT
communication.
Debug UART interface supports 115200bps baud rate. It can be used for Linux console and log
output.
The following tables show the pin definition.
Table 11: Pin Definition of the Main UART Interface
Pin Name
Pin No.
RI
62
DCD
63
CTS
64
RTS
65
DTR
66
TXD
67
RXD
68
Table 12: Pin Definition of the Debug UART Interface
Pin Name
Pin No.
DBG_TXD
12
DBG_RXD
11
The logic levels are described in the following table.
EC25-V_User_Manual
69
I/O
Description
DO
Ring indicator
DO
Data carrier detection
DO
Clear to send
DI
Request to send
DI
Sleep mode control
DO
Transmit data
DI
Receive data
I/O
Description
DO
Transmit data
DI
Receive data
Confidential / Released
LTE Module Series
EC25-V User Manual
Comment
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
Comment
1.8V power domain
1.8V power domain
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